Printing machinery



July 7, 1925.

T. F'. ELSWORTH PRINTING MACHINERY Filed 00$. 22, 1923 2 Sheets-Sheet .1

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I11L11/%O14 118 worth $3 July 7, 1925.

T. F. ELSWORTH PRINTING MACHINERY Filed Oct. 22. 1923 2 Sheets-Sheet 2Inve miter T E E68 war-271 Patented July 7, 1925.

cairn!) STATES PATENT OFFECE.

THOMAS FRANK ELSWORTH, OF LEEDS, ENGLAND, .AS'SIGNOR OF ONE-HALF TOGEORGE MANN AND COMPANY, LIMITED, OE LEEDS. YORK, ENGLAND.

PRINTING MACHINERY.

Application filed October 22, 1923. Seria1 No. 670,210.

To all whom it may concern:

Be it known that I, THOMAS FRANK Enswon'rrr, a subjectof the King ofGreat Britain and Ireland, and residing at Rycroft, 15 Davies Avenue,Roundhay, Leeds, in the county of York, England, have invented certainnew and useful Improvements in and Relating to Printing lViachinery, ofwhich the following is a specification.

This invention relates to improvements in printing machinery,particularly those of the kind described in United States Patentspecification No. 1,210,202,1916.

Reference to the said patent specification will show that the transfercylinder is geared directly with the continuously rotating impressioncylinder, that the revolutions of the cylinders are similar, and thatthe printed sheet is taken from and re-transferred to the impressioncylinder at the same peripheral point thereon, but at a different radiusrelative to the axis of the said cylinder.

The object of the invention is to overcom the ditliculty experiencedwith machines of this type in taking one sheet from the impressioncylinder without disturbing in any way the other sheet lying underneathsince the edges of the two sheets are on the same peripheral point onthe cylinder.

With this object, the invention consists in the novel features ofconstruction and the combination of parts to be hereinafter describedand more particularly pointed out in the claims.

Referring to the accompanying drawings which illustrate by way ofexample one embodiment of the invention 2- Figure 1 is an elevationshowing the position of the impression and transfer cylinder when theprinted sheet is being transferred from the former to the latter;

Figure 2 is similar to Figure 1 showing the position in which theprinted sheet is being re-transferred from the transfer to theimpression cylinder;

Figure 3 is a sectionalview on line AB of Figure 2;

Figure 4 is a plan view of Figure 1 looking in the direction of thearrow.

The impression cylinder 1 is provided with impression grippers 2 whichare operated by any known means. Mounted above the grippers 2 areadditional grippers 3 called delivery grippers, also operated by knownmeans, the use of which will be hereinafter described. The transfercylinder 1 is provided with grippers 5 actuated by rnown means. It isalso provided with a toothed wheel 6 gearing with similar toothed wheel7 rigidly mounted upon the impression cylinder. The toothed wheel 6 isprovided with a boss 8 mounted coaxially with the transfer cylinder. Onone end of the boss 8 is mountedloosely a member 9 which is fixed to thetransfer cylinder by means of nuts and set screws 10 which pass throughslots 11 in said member 9. By slackening the nuts the relative positionsof the member 9 and the transfer cylinder can be altered so that theposition for the co-operation of the grippers can be adjusted. Themember 9 is provided with a double guide 12 which is set at an angle toa diameter of the transfer cylinder. In this guide 12 a driving member13 is provided which is adapted to slide therein.

The toothed wheel 6 is provided with a suitable boss 14 to which ispivotally mounted a rocking lever 15. The other end of the rocking lever15 is pivotally connected to the driving member 13 by means of a pin 16orthe like. In this manner the transfer cylinder, 4, is yieldinglyconnected to the tooth wheel, 6. The other end of the boss 8 of thetoothed wheel 6 is provided with a cam member 17' loosely mounted onsaid boss coaxially with the impression cylinder and connected to theframing of the machine so as to be kept stationary by means of a linkmember 18. This cam member 17 is provided with internal grooves 19, 19-into which is fitted a switclipiece 20 which slides therein on therotation of the transfer cylinder. The centre of this switch-piece 20 ispivotally connected to the centre of the end of the link member 15 onthe opposite side to which the driving member 13 is pivoted. As thetoothed wheel 6 is rotated by the wheel 7, the transfer cylinder and theswitch-piece 20 rotate together. The switchpiece 20 as it slides in thegrooves 19, 19

rocks the lever 15 either away from or fore the grippers on the transfercylinder co-operate with the delivery grippers 3 on the impressioncylinder instead of the grip =pers Qas in Figure 1.

The printed sheet is retransferred to the impression cylinder at a pointon the periphery of the latter different from that at which the sheetwas transferred to the trans- -fer cylinder, but this point issituatedat the same radial height "from the impression cylinder.

In the figures the cam 17 is so arranged with two grooves 19, 19 thatthe switchpiece 20 is displaced so as to perform one revolution in thegroove 19 and the next revolution in the groove 19, thus coming back toits initial position after every two revolutions. The machine thusperforms two revolutions for each cycle. The cycle need not, however,comprise only two revolutions but any number may be used.

The flange of the toothed wheel-(Sis provided with openings or slots 21through which the nuts 10 which hold the member 9' one or morerevolutions of said cylinder the sheet is transferred to the grippers 5onthe transfer cylinder at a point on the line -D, the grippers 2'beingreleased automatically by any well known means not shown in thedrawing.

The transfer cylinder rotates, and during its rotation is movedrelatively to the toothed advance of the impression cylinder and -co-,[operates-amth the delu 'ery grippers 3-onthe impression cylinder. Atthis point the grippers 5 are released and the delivery grippers 3secure the sheet to the impression cylinder, said impression cylinderthen set forth.

described without'depairting from the spirit of the invention.

. Having now described my invention what I claim as new and desire tosecure by Letters Patent is 1. In a printing machine, the combinationcomprising an impression cylinder, a transfer cylinder, gripping meanson said transfer cylinder for holding the sheets of paper vand means foralternately advancing and retarding said transfer cylinder relatively tosaid impression cylinder so that said gripping means may registeralternately with twodistinct points on the periphery ofsaidimpressioncylinder, as set forth;

2. In a printing machine, the combination comprising an impressioncylinder, a trans fer cylinder, a plurality of sets of grippers on saidimpression cylinder, 3. set of grippers on said transfercylinder, andmeans for alternately advancing and retarding saidtransfer cylinderrelatively to said im pression cylinder so that the transfergrippers mayco-act alternately with two sets of impression grippers, :as set forth.

3. Ina printing machine the combination comprising an impressioncylinder, a. trans fer cylinder, a toothedwheel m'o'un ted upon thetransfer cylinder, means ford'riving'the transfer cylinder from theimpression cyl inder, and means fora-lternately advancing and retardingone of said cylinders relatively to the other, said means including ayielding connection between said toothed wheel and transfer cylindertogether with a cam member and switch plate for varying the position ofsaid yielding connection, as

4;. In a printingnnaehine the combinatimi comprisingan impressioncylinder, a transfer cylinder rotating at the same number of revolutionsas said impression cylirxler, two "sets of grippers mounted on saidimpmsskm cylinder, one set of grippers mounted on said transfercylinder, and means for alter- 'nately advancing and retarding thetransfer cylinder :so that its grippers :co-act first with one set andthen with the other set ofgri person the impression cylinder, as setfortli.

In testimony whereof 'I have signed my nameto this specification;

THOMAS FRANK ELSWORTH,

